Air-pump.



I shown in elevation in Fig. 1 and the other DANIEL KLEIN, OF SPOKANE,WASHINGTON.

AIR-PUMP.

Specification of Letters Patent.

Patented Sept. 26, 1911.

Application filed June 8, 1910. Serial No. 565,725.

To all whom it may concern:

Be it known that I, DANIEL KLEIN, a citizen of the United States,residing at Spokane, in the county of Spokane and State of Washington,have invented a new and useful Air-Pump, of which the following is aspecification.

This invention has reference to improvements in air pumps and isdesigned more particularly for use in the production of sub-atmosphericpressure in a conduit connected with pulsator-type milking machines.

Air pumps, as ordinarily constructed for exhausting air from a containeror conduit are not adapted to meet the conditions present where milkingmachines are used. The man or men usually employed to operate the pumpand the milking machines are not experts in runnin complicated machineryand they are usually neglectful in attending to the lubrication of thepumps, especially where numerous bearings must be frequently suppliedwith oil or other lubricant, the result being that the machines soon rundry with resultant excessive wear.

With the present invention the construction is such that a moderatesupply of lubricant will last for a long time and may be introduced intothe structure at one point only, the operation of the pump causing thelubricant to be thrown to all parts needing lubrication.

The invention likewise includes means whereby the pump willautomatically maintain parts liable to become heated by the compressionof air in a comparatively chilled condition.

The invention will be best understood from a consideration of thefollowing description taken in connection with the accompanying drawingsforming a part of this specification, in which drawings Figure 1 is anelevation with parts in section of an air exhausting pump constructed inaccordance with the present invention.

Fig.2 is a top plan view of the same.

The pump structure is referably of the twin type and consequent y thereare provided two pump cylinders l of which one is is shown in verticaldiametric section. Each cylinder 1 is merged into a laterally extendedbase portion 2 on the bottom of which are formed flanges 3 so that thetwo pump structures may be united by side strips 4. suitably perforatedfor the passage of screws or bolts whereby the pumps may be fastened tosome stationary structure. WVithin each cylinder 1 there is a piston 5which may be of the trunk type and is provided with packing rings 6 andwith the usual diametrically disposed lugs 7 provided with matchingpassages for a pm 8 whereby one end of a pitman 9 is connected to thepiston.

Opposite sides of the basic portion 2 of the two pumps are provided withsuitable passages 10 covered b face plates 11, 12 respectively, theseveral passages 10 being in line one with the other. Each face plate 12is formed with a central extended bearing 13 for a drive shaft 14 ofsufficient length to enter both basic portions 2 of the pumps. Betweenthe pumps the shaft 13 carries a pulley 15 for the application of powerby a belt, but it will be understood that power may be applied to theshaft in any convenient manner. At each end of the shaft 14 the lattercarries a crank disk 16 provided with a crank pin 17 receiving the endof the pitman 9 remote from that connected to the piston and the pitmanis held to the pin 17 by a suitable cotter pin 18, the pitman at thispoint being flanked by suitable washers 19.

Each cylinder 1 is provided with a head .20 bolted in the usual mannerto the cylinder body. On the outer face of each head are formedcylindrical extensions 21, 22 respectively, although this does notpreclude the formation of these extensions of separate pieces.Coincident with the extensions 21, 22 are passages through the head 20having respective valve seats 23, 24, which for convenience ofmanufacture may be made separate from the head 20 and secured in thepassages formed therethrough.

Lodged normally in the valve seat 23 is'a valve 25 having a stem 26extending through a guide 27 011 a plate 28 seated on a shoulder abovethe valve seat 23, which shoulder may be formed by counter boring thecylinder 21. The plate 28 is formed with passages 29 for thetransmission of air there-through. The valve stem 26 is surrounded by aspring 30 lodged between the end of the guide 27 and a nut 31 applied tothe valve stem 26 and locked thereto in any appropriate mannerpermitting the desired adjustment of the spring. The valve 25 is soarranged as to open toward the cylinder 1. Normally seatment of theseparts being like that described with reference to the valve 25. Theplate 35 is held to the shoulder upon which it normally rests by aspring 39 lodged within the extension 22 between the said plate and theoverhanging portion ofa neck 40 made fast to the outer end of theextension 22, this neck 40 being replaceable by any suitable connection.

The extensions 21 of the two cylinders are connected by a bridge conduit41 provided with a single inlet 42 designed to be connected to theconduit leading to the milking machine or machines of the systemcontrolled by the pump of the present invention. The pulsator type ofmilking machines operating on sub-atmospheric pressure being well known,such machines need no description herein.

The bottom wall of each basic portion 2 is in the form of a curved web43 beginning substantially coincident with the lower edges of theopenings 10 and made concave to constitute a pocket or receptacle. Thecap plate 11 of each basic portion 2 is provided with a window 44 bymeans of which the interior of the basic portion 2 may be observed fromtime to time. Extending through the plate 11 to the interior of thebasic portion 2 is an ell 45 from which there leads a pipe 46terminating in a nozzle 47 adjacent to the head 20 where formed with orhaving attached thereto the extension 22 containing the valve 32. Eachbasic portion 2 may be provided with a drain valve 48. It will beunderstood that wherever packing is needed it is provided even thoughnot indicated in the drawings.

Because of the conditions under which milking machines are used the pumpof the present invention is made of small size and driven at high speedreaching at times upward of six hundred strokes per minute. This givesthe required displacement of the air for the proper operation of thepulsators of the milking machine while the weight of the machine and thepower necessary to drive the same are reduced to a minimum. At the sametime a very efficient lubrica tion is obtained by the introduction of amass of oil or other lubricant in each sub base 20 where it is retainedby the concave web 43 and the lower end of the pitman splashes the oilwith great violence to all the bearings requiring lubrication, a supplyof oil in the basicportion 2 lasting for a month or more. The window 44enables an operator to ascertain the height of the oil within the basicmember 2 and at long intervals more oil may be introduced, for whichpurpose a suitable inlet pipe 49 may be provided, such pipe of coursebeing pro vided with a removable cap. To balance the pump the pistonsmay be so arranged as to move in opposite directions.

With such a pump in operation air is drawn into the bridging pipe 41 andalternately through the valves 25 to the interior of the cylinders 1when the piston in the cylinder is moving downward as viewed in Fig. 1.On the return stroke of the piston the valve 25 closes and the valve 32is opened by the pressure established by the return or upward stroke ofthe piston and the air is driven out through the passage unclosed by thevalve 32 and may escape to the atmosphere or be otherwise conductedaway. Since more or less compression of the air within the cylinder 1 isnecessary to open the valve 32 there is a certain amount of heat thusgenerated and the air so heated in passing through the valve seat 24 andextension 22 will heat the parts therein contained. Ordinarily this heatis disposed of by a water jacket or similar means. The movement of thepiston 5 toward and from the basic portion 2 tends to create alternatepressure and vacuum conditions within the basic portion 2. As the piston5 descends the air within the basic portion 2 is compressed and findsescape throughv the pipe 46 and is directed by the nozzle 47 against thehead of the cylinder and against the eXten-' sion 22 thus chilling theseparts and by conduction maintaining the valve 32 and the valve 24 andadjacent parts in an appropriately chilled condition. When the piston 5is moving upwardly then there is created sub-atmospheric pressure withinthe basic portion 2 and the atmospheric air willenter through the pipe46 and the rush of air therein will create a current about the head 20and extension 22 also serving to chill these parts. Since there is nomaterial compression within the basic portion 2 on the downward strokeof the piston 5 the air. is-

suing from the pipe 46 is not heated to any material extent and is coldenough to cause extraction of heat from the head 20 and adjacent parts.Not only does a small size high speed air pump facilitate thelubrication of these parts but because of its small size and ease ofrunning not only reduces the first cost of the pump but produces a verymaterial saving in power and fuel both of these items amounting toconsiderable in milking machine systems. By forming the basic portion 2of each pump with lateral extensions in the direction of the plane ofmovement of the pitman, the capacity for lubricant is correspondinglyincreased and the intervals for the renewal of such lubricant arecorrespondingl extended while the increased material nee ed for theselateral extensions is so small as to be negligible.

It will be understood, of course, that while a du lex pump is shown anddescribed, un er some circumstances the invention may be incorporated ina single cylinder pump, or the pump may have more than two cylinders.

What is claimed is In an air pump, a crank case, a cylinder supportedthereon, casings upon the cylinder, inlet and exhaust valves within therespective casings, said crank case having an opening, a piston mountedfor reciprocation within the cylinder and constituting means for forcingwarm air outwardly through and sucking cool air inwardly through theopening, and a pipe extending from the opening and terminating in anozzle for directing currents of air across the casing of the exhaustvalve durin the discharge of air from and the suction 0 air to the crankcase.

In testimony that I claim the foregoing as my own, I have hereto afiixedmy signature in the presence of two witnesses.

DANIEL KLEIN. lVitnesses:

F. N. MARTIN, J. A. GILL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

